The Paramount Blackhorn 209 Powder Tubes are the simple solution for keeping your Blackhorn Powder at ready to load a powder charge quickly and effortlessly in the field. The magnum powder tubes hold up to 150 grains of Blackhorn 209 or other loose black powder per tube and come with a 20-150 grain unit volumetric measurement on the side of the see-through, durable plastic tube to indicate how much powder is in each tube.